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            <h1 style="display: none">生命周期</h1>
            
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                    本文最后更新于：2023年5月23日 晚上
                  
                
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                <h1 id="前言"><a href="#前言" class="headerlink" title="前言"></a>前言</h1><p>在编程世界中，每个变量、函数、类等一切被代码创造出来的东西，都有其自己的生命周期。</p>
<p>所以，Vue组件也一样。</p>
<p>了解组件的生命周期，对我们的开发起到了至关重要的作用。</p>
<p>下面会从 <strong>选项式api</strong> 与 <strong>组合式api</strong> 两个方面来介绍生命周期。</p>
<p>实际上，两种生命周期，都是互通的，唯一不同的是回调函数的使用。</p>
<p>而 <strong>组合式api</strong> 的生命周期函数，是我们必须要掌握的。</p>
<h1 id="生命周期解读"><a href="#生命周期解读" class="headerlink" title="生命周期解读"></a>生命周期解读</h1><p><img src="/my-blog/img/use/VueLifecycle.png" srcset="/my-blog/img/loading.gif" lazyload></p>
<p>组件生命周期，一共经历下面几个阶段：</p>
<ul>
<li>beforeCreate，创建之前。如果是选项式api，无法通过this来访问组件的属性和方法。</li>
<li>created，组件创建后。如果是选项式api，可以通过this来访问组件的属性和方法。在beforeCreate过渡到created之间，组件会进行数据初始化。无法访问template模板中的dom</li>
<li>beforeMount，组件创建了但是还没挂载生成Dom。无法访问template模板中的dom</li>
<li>mounted，组件挂载成功，这时候可以访问template模板中的dom</li>
<li>beforeUpdate，监测到组件属性有更新</li>
<li>updated，组件已更新完毕</li>
<li>beforeUnmount，组件销毁之前。一般出现在页面跳转，弹窗关闭，v-if</li>
<li>unmounted，组件已销毁</li>
</ul>
<p>我们最常用的生命周期函数为：created、mounted、unmounted</p>
<ul>
<li>created, 一般用来调用接口，获取初始化数据。比如：获取用例表格数据</li>
<li>mounted，一般用来操作dom元素，比如：初始化高度、设置监听函数、echarts初始化图表</li>
<li>unmounted，一般用来销毁监听函数。</li>
</ul>
<h1 id="选项式api生命周期函数"><a href="#选项式api生命周期函数" class="headerlink" title="选项式api生命周期函数"></a>选项式api生命周期函数</h1><p>生命周期函数，都需要接收一个回调函数。</p>
<p>用来当对应生命周期触发时，能够执行我们想要执行的函数。</p>
<figure class="highlight javascript"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br></pre></td><td class="code"><pre><code class="hljs javascript"><span class="hljs-attr">methods</span>: &#123;<br>    <span class="hljs-title function_">onMounted</span>(<span class="hljs-params"></span>)&#123;<br>        <span class="hljs-variable language_">console</span>.<span class="hljs-title function_">log</span>(<span class="hljs-string">&quot;我需要在 mounted 时触发&quot;</span>)<br>    &#125;<br>&#125;,<br><span class="hljs-title function_">created</span>(<span class="hljs-params"></span>)&#123;<br><br>&#125;,<br><span class="hljs-title function_">mounted</span>(<span class="hljs-params"></span>)&#123;<br>    <span class="hljs-variable language_">this</span>.<span class="hljs-title function_">onMounted</span>()<br>&#125;<br></code></pre></td></tr></table></figure>

<p>其他生命周期函数的使用方式都一样，使用时的注意事项请参考上述说明。</p>
<h1 id="组合式api生命函数"><a href="#组合式api生命函数" class="headerlink" title="组合式api生命函数"></a>组合式api生命函数</h1><p>组合式api，所有的组件逻辑，都被放在 <strong>setup</strong> 函数中进行处理。</p>
<p>所以生命函数的使用方式，也和 <strong>选项式api</strong> 有所不同</p>
<figure class="highlight plaintext"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br></pre></td><td class="code"><pre><code class="hljs vue">&lt;script setup&gt;<br>import &#123; ref, onMounted &#125; from &#x27;vue&#x27;<br><br>const el = ref()<br><br>onMounted(() =&gt; &#123;<br>  el.value // &lt;div&gt;<br>&#125;)<br>&lt;/script&gt;<br><br>&lt;template&gt;<br>  &lt;div ref=&quot;el&quot;&gt;&lt;/div&gt;<br>&lt;/template&gt;<br></code></pre></td></tr></table></figure>

<p>上述 <strong>onMounted</strong> 对应的是 <strong>mounted</strong></p>
<ul>
<li>onBeforeMount，对应 beforeMount</li>
<li>onMounted，对应 mounted</li>
<li>onBeforeUpdate，对应 beforeUpdate</li>
<li>onUpdated，对应 updated</li>
<li>onBeforeUnmount，对应 beforeUnmount</li>
<li>onUnmounted，对应 unmounted</li>
</ul>
<p>可以发现，组合式api的生命周期函数中，缺少了 beforeCreate、created。</p>
<p>是因为，<strong>setup</strong> 函数，本身执行时期，就在 <strong>组件创建之前</strong>。</p>
<p>当 <strong>setup</strong> 函数，执行完毕后，组件也就经历了 <strong>beforeCreate、created</strong> 。</p>
<p>所以在 <strong>setup</strong> 中，你可以直接访问组件属性、方法。</p>
<h1 id="实际例子"><a href="#实际例子" class="headerlink" title="实际例子"></a>实际例子</h1><h2 id="onBeforeMount"><a href="#onBeforeMount" class="headerlink" title="onBeforeMount"></a>onBeforeMount</h2><figure class="highlight plaintext"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br></pre></td><td class="code"><pre><code class="hljs vue">&lt;script setup&gt;<br>import &#123; ref, onBeforeMount &#125; from &#x27;vue&#x27;<br><br>import &#123;apiGetTableDataList&#125; from &#x27;apixxx.js&#x27;<br><br>const tableDataList = ref([])<br><br>const getTableData = ()=&gt;&#123;<br>    apiGetTableDataList()<br>    .then(res=&gt;&#123;<br>        tableDataList.value = res.data.tableDataList<br>    &#125;)<br>&#125;<br><br>onBeforeMount(getTableData)<br>&lt;/script&gt;<br><br>&lt;template&gt;<br>    &lt;div v-for=&quot;table in tableDataList&quot;&gt;&#123;&#123;table&#125;&#125;&lt;/div&gt;<br>&lt;/template&gt;<br></code></pre></td></tr></table></figure>

<h2 id="onMounted"><a href="#onMounted" class="headerlink" title="onMounted"></a>onMounted</h2><figure class="highlight plaintext"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br></pre></td><td class="code"><pre><code class="hljs vue">&lt;script setup&gt;<br>import &#123; ref, onMounted &#125; from &#x27;vue&#x27;<br><br>const domHeight = ref(0)<br><br>const getHeight = ()=&gt;&#123;<br>    const domEl<br>    domHeight.value = domEl.offsetHeight - 100<br>&#125;<br><br>onMounted(getHeight)<br>&lt;/script&gt;<br>&lt;template&gt;<br>    &lt;div :style=&#123;height: domHeight&#125;&gt;&lt;/div&gt;<br>&lt;/template&gt;<br></code></pre></td></tr></table></figure>
                
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